Details of the Statements of Profit or Loss and Other Comprehensive Income (Revenues) (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Details Of Statements Of Profit Or Loss And Other Comprehensive Income Schedule Of Costs And Depreciation Details
Revenues from the sale of solar electricity	€ 13,150	€ 11,632	€ 12,446
Revenues from the sale of gas and power produced by anaerobic digestion plants	303
Revenues from concessions project	183
Total Revenues	€ 13,636	€ 11,632	€ 12,446

The amount of revenue arising from the sale of oil and gas products. [Refer: Revenue]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2018-01-01
-Name IAS
-Number 18
-IssueDate 2017-01-01
-Paragraph 35
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=18&date=2017-03-02&anchor=para_35_b_i&doctype=Standard&book=B
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration